I purchased a set of ground control coil-over sleeves to make a set of coil-overs that will last for more than a year for the caddy. These are the rear coils that i did not need for the truck and have not used. This set is for use with Koni shocks. The springs are made by Eibach and are rated at 200lbs/in. The sleeves and collars are made of aluminum and wont ever rust together. I have a nearly identical set on my Mk4 GTI for ~4 yrs and have never needed to do anything but loosen the locking screw and turn the collars by hand to adjust. These would be great for leveling out the ride height of a car with lowering springs. I'm asking $150 and am willing to ship.